Phreon

I've been entertaining buying a used Outback/Legacy wagon. All of the vehicles in my range of $5-7k have at least 100k miles on them. I've been a die hard Audi fan and 100K is just starting to break one in; what is the lifespan of the average Subaru? What's the fair going price for a manual transmission 97-99 Legacy wagon with around 100k miles? How reliable is the viscous coupling on manual trans. Subarus? What should I look out for? Thanks, Phreon (Audi defector)